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vduse: Validate vq_num in vduse_validate_config()

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Add a limit to 'config->vq_num' which is user controlled data which
comes from an vduse_ioctl to prevent large memory allocations.

Micheal says  - This limit is somewhat arbitrary.
However, currently virtio pci and ccw are limited to a 16 bit vq number.
While MMIO isn't it is also isn't used with lots of VQs due to
current lack of support for per-vq interrupts.
Thus, the 0xffff limit on number of VQs corresponding
to a 16-bit VQ number seems sufficient for now.

This is found using static analysis with smatch.

Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Message-Id: <20221128155717.2579992-1-harshit.m.mogalapalli@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Harshit Mogalapalli 2022-11-28 07:57:15 -08:00 committed by Michael S. Tsirkin
parent 81931012bd
commit 937c783aa3
1 changed files with 3 additions and 0 deletions
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3
drivers/vdpa/vdpa_user/vduse_dev.c
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@ -1440,6 +1440,9 @@ static bool vduse_validate_config(struct vduse_dev_config *config)
if (config->config_size > PAGE_SIZE)
return false;
if (config->vq_num > 0xffff)
return false;
if (!device_is_allowed(config->device_id))
return false;